diff --git a/app/nginx-1.11.10/src/core/ngx_connection.c b/app/nginx-1.11.10/src/core/ngx_connection.c
index 9fe1dbf6..9739fed6 100644
--- a/app/nginx-1.11.10/src/core/ngx_connection.c
+++ b/app/nginx-1.11.10/src/core/ngx_connection.c
@@ -1076,9 +1076,6 @@ ngx_get_connection(ngx_socket_t s, ngx_log_t *log)
     ngx_uint_t         instance;
     ngx_event_t       *rev, *wev;
     ngx_connection_t  *c;
-#if (NGX_HAVE_FSTACK)
-    ngx_atomic_uint_t  success;
-#endif
 
     /* disable warning: Win32 SOCKET is u_int while UNIX socket is int */
 
@@ -1089,35 +1086,7 @@ ngx_get_connection(ngx_socket_t s, ngx_log_t *log)
                       s, ngx_cycle->files_n);
         return NULL;
     }
-#if (NGX_HAVE_FSTACK)
-#ifndef unlikely
-#define unlikely(x)  __builtin_expect((x),0)
-#endif
-    /* move ngx_cycle->free_connections atomically */
-	do {
-		/* Restore n as it may change every loop */
-		c = ngx_cycle->free_connections;
 
-        if (c == NULL) {
-            ngx_drain_connections((ngx_cycle_t *) ngx_cycle);
-            c = ngx_cycle->free_connections;
-        }
-
-        if (c == NULL) {
-            ngx_log_error(NGX_LOG_ALERT, log, 0,
-                        "%ui worker_connections are not enough",
-                        ngx_cycle->connection_n);
-
-            return NULL;
-        }
-
-		success = ngx_atomic_cmp_set(&ngx_cycle->free_connections, c,
-					      c->data);
-
-	} while (unlikely(success == 0));
-
-	ngx_memory_barrier();
-#else
     c = ngx_cycle->free_connections;
 
     if (c == NULL) {
@@ -1134,7 +1103,6 @@ ngx_get_connection(ngx_socket_t s, ngx_log_t *log)
     }
 
     ngx_cycle->free_connections = c->data;
-#endif
     ngx_cycle->free_connection_n--;
 
     if (ngx_cycle->files && ngx_cycle->files[s] == NULL) {
@@ -1178,25 +1146,8 @@ ngx_get_connection(ngx_socket_t s, ngx_log_t *log)
 void
 ngx_free_connection(ngx_connection_t *c)
 {
-#if (NGX_HAVE_FSTACK)
-    ngx_atomic_uint_t  success;
-
-    /* move ngx_cycle->free_connections atomically */
-	do {
-		/* Restore n as it may change every loop */
-		c->data = ngx_cycle->free_connections;
-
-		success = ngx_atomic_cmp_set(&ngx_cycle->free_connections, c->data,
-					      c);
-
-	} while (unlikely(success == 0));
-
-	ngx_memory_barrier();
-
-#else
+    c->data = ngx_cycle->free_connections;
     ngx_cycle->free_connections = c;
-
-#endif
     ngx_cycle->free_connection_n++;
 
     if (ngx_cycle->files && ngx_cycle->files[c->fd] == c) {